Minor corrections
- Only the G5 *Quad* had PCI-E, all the others were PCI-X (yuck)
The Quad was also the only one to take DDR2 RAM, though did support up to 16GB
All Apple Macs though are PPC64 Big Endian, not ppc64le. This causes no end of problems with software that now assumes "IF PPC = LE"
All of the PowerMac11,2 models that used the dual-core on a single silicon 970MP G5s supported PCIe:
https://everymac.com/ultimate-mac-lookup/?search_keywords=Po...
The quad was just two dual cores in a single chassis, with an unfortunately prone to breaking liquid cooling setup.